cellForRowAt 在 childTableView 中不起作用
cellForRowAt is not working in the childTableView
我是一名 entry-level swift 开发人员,我正在开发个人应用程序,但我的 "tableViewController".
遇到了问题
我有第一个表视图,我从 API 中获取一些事件,然后我想做的是在我 Select 事件时显示 "detailViewController"。
到目前为止,一切似乎都很完美,但我的问题是我的 "detailsviewcontroller" 有一张活动图片、标题……然后是一个集成的 "tableview" 来显示详细信息。此时 numberOfRowsInSection 函数起作用,但从未调用 cellForRowAt 来填充集成表视图。
有什么帮助吗?我希望我的解释清楚
这是 "childtableview" 的代码,我想在其中显示事件详细信息(我使用数组字符只是为了尝试:
import UIKit
import SwiftyJSON
class ChildDetailsViewController: UIViewController, UITableViewDelegate {
var event: JSON?
let detailsTableView = UITableView()
var characters = ["test1", "test2", "test3", "test4"]
override func loadView() {
print("details")
super.loadView()
view.addSubview(detailsTableView)
detailsTableView.translatesAutoresizingMaskIntoConstraints = false
detailsTableView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
detailsTableView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
detailsTableView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
detailsTableView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
detailsTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
detailsTableView.dataSource = self
detailsTableView.delegate = self
detailsTableView.reloadData()
}
}
extension ChildDetailsViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//this insctruction does print 4
print(characters.count)
//but it doesn't return 4 cells in the tableview
return characters.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
print(characters[indexPath.row])
cell.textLabel?.text = characters[indexPath.row]
return cell
}
}
这里是包含图像和标题的 detailsViewController 代码以及 child 表格视图:
import UIKit
import SwiftyJSON
class EventDetailsViewController: UIViewController {
var event : JSON?
@IBOutlet weak var segmentedController: UISegmentedControl!
@IBOutlet weak var ticketsView: UIView!
@IBOutlet weak var locationView: UIView!
@IBOutlet weak var detailsView: UIView!
@IBOutlet weak var eventImage: UIImageView!
@IBOutlet weak var eventTitle: UILabel!
let newView = UIView()
let childDetails = ChildDetailsViewController()
var views : [UIView]!
override func viewDidLoad() {
filltheImageAndTile()
// add new view to the main view
super.viewDidLoad()
view.addSubview(newView)
//locate it under the event image and the segnented controller
newView.translatesAutoresizingMaskIntoConstraints = false
newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
newView.topAnchor.constraint(equalTo: segmentedController.bottomAnchor, constant: 25).isActive = true
newView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
newView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
views = [UIView]()
views.append(ChildDetailsViewController().view)
views.append(ChildLocationViewController().view)
for itemView in views {
newView.addSubview(itemView)
}
newView.bringSubviewToFront(ChildDetailsViewController().view)
}
@IBAction func segmentedControlOptionChanged(_ sender: UISegmentedControl) {
newView.bringSubviewToFront(views[sender.selectedSegmentIndex])
}
@IBAction func backButtonClicked(_ sender: UIBarButtonItem) {
self.navigationController?.dismiss(animated: true)
}
}
1- 这个
views.append(ChildDetailsViewController().view)
views.append(ChildLocationViewController().view)
不是添加包含的 vcs 检查的正确方法 Adding a view controller as a subview in another view controller
2- 你需要给 newView
一个 height/bottom 约束
问题是您正在创建 ChildDetailsViewController
的实例并将其视图添加到 views
数组,但 ChildDetailsViewController
的实例从未保存在任何地方,也从未将其添加到父级视图控制器。并且 newView.bringSubviewToFront(ChildDetailsViewController().view)
这一行不会执行任何操作,因为您正在创建一个新实例并将其视图置于最前面,但它从未被添加到超级视图中的任何地方
views = [UIView]()
views.append(ChildDetailsViewController().view)//this shouldn't be like this
views.append(ChildLocationViewController().view)
for itemView in views {
newView.addSubview(itemView)
}
newView.bringSubviewToFront(ChildDetailsViewController().view)//this shouldn't be like this
您已经创建了一个实例childDetails
您应该像下面那样使用它
childDetails.willMove(toParent: self)
self.addChild(childDetails)
let locationViewController = ChildLocationViewController()
locationViewController.willMove(toParent: self)
self.addChild(locationViewController)
views = [UIView]()
views.append(childDetails.view)
views.append(locationViewController.view)
for itemView in views {
newView.addSubview(itemView)
}
childDetails.didMove(toParent: self)
locationViewController.didMove(toParent: self)
newView.bringSubviewToFront(childDetails.view)
我是一名 entry-level swift 开发人员,我正在开发个人应用程序,但我的 "tableViewController".
遇到了问题我有第一个表视图,我从 API 中获取一些事件,然后我想做的是在我 Select 事件时显示 "detailViewController"。 到目前为止,一切似乎都很完美,但我的问题是我的 "detailsviewcontroller" 有一张活动图片、标题……然后是一个集成的 "tableview" 来显示详细信息。此时 numberOfRowsInSection 函数起作用,但从未调用 cellForRowAt 来填充集成表视图。 有什么帮助吗?我希望我的解释清楚
这是 "childtableview" 的代码,我想在其中显示事件详细信息(我使用数组字符只是为了尝试:
import UIKit
import SwiftyJSON
class ChildDetailsViewController: UIViewController, UITableViewDelegate {
var event: JSON?
let detailsTableView = UITableView()
var characters = ["test1", "test2", "test3", "test4"]
override func loadView() {
print("details")
super.loadView()
view.addSubview(detailsTableView)
detailsTableView.translatesAutoresizingMaskIntoConstraints = false
detailsTableView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true
detailsTableView.leftAnchor.constraint(equalTo: view.leftAnchor).isActive = true
detailsTableView.bottomAnchor.constraint(equalTo: view.bottomAnchor).isActive = true
detailsTableView.rightAnchor.constraint(equalTo: view.rightAnchor).isActive = true
detailsTableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
detailsTableView.dataSource = self
detailsTableView.delegate = self
detailsTableView.reloadData()
}
}
extension ChildDetailsViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//this insctruction does print 4
print(characters.count)
//but it doesn't return 4 cells in the tableview
return characters.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
print(characters[indexPath.row])
cell.textLabel?.text = characters[indexPath.row]
return cell
}
}
这里是包含图像和标题的 detailsViewController 代码以及 child 表格视图:
import UIKit
import SwiftyJSON
class EventDetailsViewController: UIViewController {
var event : JSON?
@IBOutlet weak var segmentedController: UISegmentedControl!
@IBOutlet weak var ticketsView: UIView!
@IBOutlet weak var locationView: UIView!
@IBOutlet weak var detailsView: UIView!
@IBOutlet weak var eventImage: UIImageView!
@IBOutlet weak var eventTitle: UILabel!
let newView = UIView()
let childDetails = ChildDetailsViewController()
var views : [UIView]!
override func viewDidLoad() {
filltheImageAndTile()
// add new view to the main view
super.viewDidLoad()
view.addSubview(newView)
//locate it under the event image and the segnented controller
newView.translatesAutoresizingMaskIntoConstraints = false
newView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
newView.topAnchor.constraint(equalTo: segmentedController.bottomAnchor, constant: 25).isActive = true
newView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
newView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
views = [UIView]()
views.append(ChildDetailsViewController().view)
views.append(ChildLocationViewController().view)
for itemView in views {
newView.addSubview(itemView)
}
newView.bringSubviewToFront(ChildDetailsViewController().view)
}
@IBAction func segmentedControlOptionChanged(_ sender: UISegmentedControl) {
newView.bringSubviewToFront(views[sender.selectedSegmentIndex])
}
@IBAction func backButtonClicked(_ sender: UIBarButtonItem) {
self.navigationController?.dismiss(animated: true)
}
}
1- 这个
views.append(ChildDetailsViewController().view)
views.append(ChildLocationViewController().view)
不是添加包含的 vcs 检查的正确方法 Adding a view controller as a subview in another view controller
2- 你需要给 newView
问题是您正在创建 ChildDetailsViewController
的实例并将其视图添加到 views
数组,但 ChildDetailsViewController
的实例从未保存在任何地方,也从未将其添加到父级视图控制器。并且 newView.bringSubviewToFront(ChildDetailsViewController().view)
这一行不会执行任何操作,因为您正在创建一个新实例并将其视图置于最前面,但它从未被添加到超级视图中的任何地方
views = [UIView]()
views.append(ChildDetailsViewController().view)//this shouldn't be like this
views.append(ChildLocationViewController().view)
for itemView in views {
newView.addSubview(itemView)
}
newView.bringSubviewToFront(ChildDetailsViewController().view)//this shouldn't be like this
您已经创建了一个实例childDetails
您应该像下面那样使用它
childDetails.willMove(toParent: self)
self.addChild(childDetails)
let locationViewController = ChildLocationViewController()
locationViewController.willMove(toParent: self)
self.addChild(locationViewController)
views = [UIView]()
views.append(childDetails.view)
views.append(locationViewController.view)
for itemView in views {
newView.addSubview(itemView)
}
childDetails.didMove(toParent: self)
locationViewController.didMove(toParent: self)
newView.bringSubviewToFront(childDetails.view)